Holly Madison, who spent six years as one-third of Hugh Hefner’s harem of girlfriends, has not been coy about her distaste for his engagement to fellow Playboy model, Crystal Harris. Remember when she told Life & Style that Hef was making a “hasty decision”? The ‘Holly’s World’ beauty has made up her mind, though, telling me on my HDNet show that even if she’s invited, she’s not going to that wedding.

“I feel like the attention should be on them,” Holly tells me. “It shouldn’t be about ex-girlfriends showing up and what are their reactions and stuff like that. I think it should be about them.”

Holly let slip that Hef and Crystal are thinking about tying the knot this summer. She says that if she doesn’t go, “It’s probably because I have a show in Vegas.” Smart girl!

Since Hef announced the engagement, Holly met up with the pair in early January for a taped segment for her hit E! show, which is back for season two. The encounter was “definitely awkward,” and even though a month has passed she’s still cautious about saying positive things about the next Mrs. Hefner.

“I don’t really know her,” she tells me. “I’m just really protective and want to make sure he’s making the right choices.”

One thing she’s not unsure about is ‘Holly’s World,’ which follows the bombshell and her friends as they live, work and love in Las Vegas. It airs Sundays at 10:30PM on E!, but if you want to watch more of my interview with Holly and find out what really happens at the Playboy Mansion, tune in ‘Naughty But Nice With Rob’ on Saturday at 1PM or 7PM, exclusively on HDNet.More ‘NBN’: My Chats With Joan Rivers, Billy Baldwin